asp.net ObjectDataSource: how to use
ObjectDataSource.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ObjectDataSource.aspx.cs" Inherits="ObjectDataSource" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>asp.net ObjectDataSource: how to use</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h2 style="color:Green">ObjectDataSource</h2>
<asp:ObjectDataSource
ID="ObjectDataSource1"
runat="server"
>
</asp:ObjectDataSource>
<asp:DropDownList
ID="DropDownList1"
runat="server"
>
</asp:DropDownList>
</div>
</form>
</body>
</html>
ObjectDataSource.aspx.cs
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
public partial class ObjectDataSource : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if(!this.IsPostBack)
{
ObjectDataSource1.TypeName = "Category";
ObjectDataSource1.SelectMethod = "GetCategories";
DropDownList1.DataSourceID = "ObjectDataSource1";
DropDownList1.DataTextField = "CategoryName";
DropDownList1.DataValueField = "CategoryID";
DropDownList1.BackColor = System.Drawing.Color.Crimson;
DropDownList1.ForeColor = System.Drawing.Color.Snow;
}
}
}
Category.cs
using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Configuration;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
public class Category
{
public Category(){}
public SqlDataReader GetCategories() {
SqlConnection conn = new SqlConnection();
conn.ConnectionString = WebConfigurationManager.ConnectionStrings["Northwind"].ConnectionString;
SqlCommand command = new SqlCommand();
command.CommandText = "SELECT CategoryID, CategoryName FROM Categories";
command.Connection = conn;
SqlDataReader reader;
conn.Open();
reader = command.ExecuteReader(CommandBehavior.CloseConnection);
return reader;
}
}
